After mulling over this topic and your feedback all winter, I think I have found a worthy focus for the coming ski season. I have always changed edges with my whole body. In hindsight, this move results in giving too much back to the boat. As @ShaneH suggested in the first comment to my original post, keeping the upper body leaned away from the boat during the edge transition should help my ski arc outbound resulting in a tighter rope. Nate demonstrates this idea in the first frame below from Waterski magazine:
http://waterskimag.com/files/2012/08/nate-smith-three.jpg
Easy, right? Seth pointed out in the video posted by @webbdawg99 that this type of edge change is only possible if you are open to the boat. So ... (open to the boat) + (load) + (angle) + (speed) + (keeping upper body pulling away from the boat during edge transition) = (An epic 2013)